android – 允许用户在Spinner中输入新值

首先,我是 android开发的新手.我正在构建一个小应用程序,其中包含一个微调器,其中包含四个数字的预定义set(数组),我使用ArrayAdapter将值从资源文件提供给微调器.

微调器工作正常,用户可以选择值.但我也希望用户能够输入新值,如果他们想输入新值.我该怎么做？

onCreate活动方法中的代码：

Spinner spinner =(Spinner)findViewById(R.id.spinner);
        //使用字符串数组和默认的微调器布局创建ArrayAdapter
        arrayAdapter<&CharSequence的GT; adapter = ArrayAdapter.createFromresource(这个,
        r.array.points_preset,android.R.layout.simple_spinner_item);
        //指定出现选项列表时要使用的布局
        adapter.setDropDownViewresource(android.R.layout.simple_spinner_dropdown_item);
        //将适配器应用于微调器
        spinner.setAdapter(适配器);
        spinner.setOnItemSELEctedListener(new SpinnerActivity());

SpinnerActivity类的代码：

更新以包含输入对话框：

public class SpinnerActivity extends Activity implements OnItemSELEctedListener {

        public void onItemSELEcted(AdapterView<?> parent,final View view,int pos,long id) {
            if (pos==3)
            {
                // Set an EditText view to get user input 
                final EditText input = new EditText(MainActivity.this);

                new AlertDialog.builder(MainActivity.this)
                                            .setmessage("Enter your Point here")
                    .setView(input)
                    .setPositiveButton("Ok",new DialogInterface.onClickListener() {
                         public void onClick(DialogInterface dialog,int whichButton) {
                          Editable   editable = input.getText(); 
                          //if I uncomment following line,the application terminates
                       // Spinner spinner = (Spinner) findViewById(R.id.spinner);

                         }
                    })
                    .setNegativeButton("Cancel",int whichButton) {
                                // Do nothing.
                         }
                    }).show(); 
            }

                                    }

        public void onNothingSELEcted(AdapterView<?> parent) {
            // Another interface callBACk
        }
    }
                    `

Strings.xml资源文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <String name="app_name">PointCalculator</String>
    <String name="menu_setTings">SetTings</String>
    <String-array name="points_preset">
    <item>3</item>
    <item>10</item>
    <item>0</item>
    <item>Oth</item>
    </String-array>

</resources>

SpinnerActivity类的更新和工作版本

`

public class SpinnerActivity extends Activity implements OnItemSELEctedListener {

                public void onItemSELEcted(AdapterView<?> parent,long id) {
                    if (pos==3)
                    {
                        // Set an EditText view to get user input 
                        final EditText input = new EditText(MainActivity.this);

                        new AlertDialog.builder(MainActivity.this)
                                                    .setmessage("Enter your Point here")
                            .setView(input)
                            .setPositiveButton("Ok",new DialogInterface.onClickListener() {
                                 public void onClick(DialogInterface dialog,int whichButton) {
                                  Editable   editable = input.getText(); 


                           arrayList.add(editable.toString());
                            adapter.notifyDataSetChanged();


                                 }
                            })
                            .setNegativeButton("Cancel",int whichButton) {
                                        // Do nothing.
                                 }
                            }).show(); 
                    }

                                            }

                public void onNothingSELEcted(AdapterView<?> parent) {
                    // Another interface callBACk
                }
            }`

谢谢,